TDA8380A/N2 Ver la hoja de datos (PDF) - Philips Electronics

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TDA8380A/N2

Control circuit for switched mode power supplies

Philips Electronics 

Philips Semiconductors

Control circuit for switched mode power supplies

Product specification

TDA8380A

Synchronization

The synchronisation input (pin 11) can be driven by either an optocoupler or a loosely coupled pulse transformer.

Figure 5 illustrates synchronization using the 0.85 V threshold and a digital signal connected to the SYNC input (for

example, an optocoupler between pin 11 and VCC); the duty factor of the pulse is not very important. The oscillator starts

at the first negative going edge of the sync. signal after the low voltage level has been reached. The synchronization

frequency must be lower than the free running frequency. Synchronization must never affect the period time as this will

corrupt the setting of the maximum duty factor.

Fig.5 DC coupled synchronization using the 0.85 V level.

In Fig.6 the disabling threshold (5.6 V) is used for synchronization. In this case the oscillator starts at the positive going

edge of the sync. signal.

November 1993

Fig.6 DC coupled synchronization using the 5.6 V level.

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